Horizontal vibrating screen



lFeb. 8,l 1938. R. A. DENovAN 2,107,729

" HORIZONTAL YIBRATING SCREEN Filed July 15, 195e l NVENTOR: ROBERT A. QENovAN BY M ATTORNEY.

' Petenied Feb. s, 193s PATENT OFFICE HORIZONTAL VIBRA'I'ING SCREEN Robert Andrew Denovan, Asbestos, Quebec,

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Application July 15, 1936, serial no. y90,629

6 Claims.

, This invention relates to horizontal vibrating screens and more particularly to a compound vscreen of this type. j In the usual construction of Ahorizontal screens, diiculty has been'experienced in maintaining a proper counterbalancingof the screen during its vibratory movement. .Various means for mounte 'ing such screens in order to satisfactorily take care of the reciprocal movement thereof have been suggested but these have been for the most part complicated and expensive.

It is thus an object of the invention to provide .a simply mounted screen having a plurality of sections with means for imparting reciprocal 5 movement toV such v`sections whereby they are K always in counterbalancing relation with respect rto each other. Another object is to provide a screen possessing a. versatile combination of screening functions.

'I'he invention will be described with Vreference to the accompanying drawing, in which,

Figure 1 is a plan view and Figure 2 is a side elevation.A In the drawing yI is a main screening section mounted in supporting bars I'jcarried by flat leaf springs 2 mounted on a-frame member 3 and 4l isf an outerscreening section of substantially Vthe same weight as section I formed in two parts, 5,

and 6, adjacent either end of the main section 'I'y 10 and mounted in .supporting bars 4', extending along either side ofthe main section I but independently thereof, carried by flat leaf springs 'I also mounted on the frame member 3. 8 indicates a means for imparting the necessary vibratory movement to the screen and 9 is a preliminary'scalping and Washingsection which may be provided at the receiving endof the screen.

yThe main section I is provided with a top; deck screen III and ar lower deck screen II. Outer 40 section 5 has a slightly inclined top deck screen I2 leading onto top deck screen III of sectionI .and an inclined screen pan I3 vbelow screen vI2 leading onto lower deck screen I I. Outer section 6 has a single screen I4 adapted to receive the tailings from top deck screen 4II)` 'I'he scalping section 9 has an inclined screen I5 and a screen pan I6 discharging onto top deck'V screen I2 of outer section 5. n

The means 8 for imparting reciprocal movement to the screen comprises a. shaftk I1 mounted in bearings 23 supported on frame members 24, and driven from any suitable source by means of Ybelt drives I8 to ywheels I9 mounted on the shaft, and two pairs of double ,eccentrics 20, 2| 'e 'and 2l', 2l', carried by the shaft, the correspond-- .f

ing eccentrics 20 and 20' being connected to the mainsection I by means of connecting rods 22 and the corresponding eccentrics 2| and 2 I being connected to the outer section 4 by means of connecting rods 22'. The connecting rods 22 and 22 5 maybe adjustable as to length.

In operation, crushed rock, ore or other material to be treated is fed onto the inclined scaiping screen I5, thescalpings being discharged over the end as indicated and the remainder, which 10 passes through the screen onto pan I6, is fed onto the forward end of top deck screen I2 of section 5. The screened material drops onto lower deck screen I3 and the coarser material is discharged onto top deck screen I0 of section I. Sand waste 15 passes through lower deck screen I3 and the screened material discharges onto lower deck II of section I. 'Ihe fines are deposited by lower deck screen II and the irst intermediate sizes are discharged at the end thereof. Top deck 20 screen I0 discharges onto screen I4 of section 6, which screen deposits the second intermediate sizes and discharges the oversizes.

It will be noted that the leaf springs 2 and I are Vmounted at an angle of approximately with 25 respect to the frame and thus, when the screens are fin motion, they move in the arc of a circle whose radius is the length of the leaf springs and 4whose direction is at right angles thereto, 'thus propelling the material forward over the screen 3o surfaces.

By reason of the opposed eccentrics, the screening sections I and 4 always move in opposite diobtained.

Moreover, the separation of the screens in each horizontal plane into a series of screening sections makes possible a very versatile screening arrangement as will appear from the foregoing de- 40 scription. Obviously, various' means for assembling the 'different required screening sections may be readily provided to meet various requirements.

I claim:

1.'In a horizontal vibrating screen having a supporting frame, a screening section resiliently -3 mounted thereon, a second independent screening section having screening members at either end `of said rst section resiliently mounted 50 thereon independently of said first section, and

means carried by said supporting frame for reciprocating each of said sections in opposite directions.

' 2.In a horizontal vibrating screen, a support, 55

thereof, a secondindependent frame carrying a.-

screen section located between said end screen sectionsv and means carried by said support for independently vibrating said frames.

a reciprocating frame, with screen vsections ad#- jacent the ends thereof, resiliently moruntedy on `said support, a second independent reciprocating frame, carrying a screen section located between said end screen sections, resiliently mounted on said support and means carried by said support for reciprocating each of said frames simultaneously in opposite directions.

4. In a horizontal vibrating screen, a support, a continuous outer frame, with a screen section adjacent each yend thereof, mounted on said support, an inner independent frame, carrying a screen section, located within said outer frame between said end screen sections, means for resiliently and independently mounting said frames on said support and means carried by said support for reciprocating each of said frames simul taneously in opposite directions.

5. Intll horizontal vibrating screen, a support. a pair ot frame members extending longitudinally of said support and carrying screen sections adjacent the ends thereof, inclined spring members connecting the frame members to the support, a 3. In a horizontal vibrating screen, a support,

second pair of independent frame members parallel to said first frame members and extending between said screen sections, a screen section carried thereby, inclined spring members connecting the secondpair of frame members to the support, and means carried by said support for reciproeating each of said pairs of frame members simultaneously in opposite directions.

6. In a screening device, three screens mounted on a common base in substantially end to end relationship with adjacent ends overlapping, a connecting member constraining the two end screens to move as a unit, and actuating means kfor said screens constructed and arranged to reciprocate. the middle screen and said end screens simultaneously in opposite directions.

ROBERT ANDREW DENOVAN. 

